120K What to look for or replace???

Hi, well I am still new"ish" to the whole BMW world, i am very excited with my new buy 06 Arktis Metallic e90 xi, great car i love it! Unfortunately the thing didnt come with an owners manual! =/ , i am working on getting one, just wanted to get opinions and thoughts of what usually needs replacement around this milage...120,000...it is due for an oil change soon, aside from that, I am not sure if the plugs have ever been changed, air filters etc etc...according to my (screen/computer) on the car there is still milage to go on the plugs, but not sure if it may be that someone reset it w.o changing them?, i suppose i can check them, but just wanted some thoughts of what is good preventative maintnance on them around this milage... Thanks!